How severe is CVE-2026-40883?

CVE-2026-40883 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2026-40883 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40883?

CVE-2026-40883 primarily affects Goshs. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-40883?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-40883 have an EU (EUVD) identifier?

Yes. CVE-2026-40883 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24270.

When was CVE-2026-40883 published?

CVE-2026-40883 was published on 2026-04-21 and last updated on 2026-06-17.

CVE-2026-40883

CVE-2026-40883 is a high-severity vulnerability in Goshs with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-352.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v4: 6.1
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-24270
Weakness: CWE-352
Affected product: Goshs
Published: 2026-04-21
Last modified: 2026-06-17

Description

goshs is a SimpleHTTPServer written in Go. From 2.0.0-beta.4 to 2.0.0-beta.5, goshs contains a cross-site request forgery issue in its state-changing HTTP GET routes. An external attacker can cause an already authenticated browser to trigger destructive actions such as ?delete and ?mkdir because goshs relies on HTTP basic auth alone and performs no CSRF, Origin, or Referer validation for those routes. This vulnerability is fixed in 2.0.0-beta.6.

Frequently asked questions

What is CVE-2026-40883?: goshs is a SimpleHTTPServer written in Go. From 2.0.0-beta.4 to 2.0.0-beta.5, goshs contains a cross-site request forgery issue in its state-changing HTTP GET routes. An external attacker can cause an already authenticated browser to trigger destructive actions such as ?delete and ?mkdir because goshs relies on HTTP basic auth alone and performs no CSRF, Origin, or Referer validation for those routes. This vulnerability is fixed in 2.0.0-beta.6.
How severe is CVE-2026-40883?: CVE-2026-40883 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2026-40883 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40883?: CVE-2026-40883 primarily affects Goshs. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-40883?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-40883 have an EU (EUVD) identifier?: Yes. CVE-2026-40883 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24270.
When was CVE-2026-40883 published?: CVE-2026-40883 was published on 2026-04-21 and last updated on 2026-06-17.

References

https://github.com/patrickhener/goshs/security/advisories/GHSA-jrq5-hg6x-j6g3

Affected products (2)

cpe:2.3:a:goshs:goshs:2.0.0:beta4:*:*:*:go:*:*
cpe:2.3:a:goshs:goshs:2.0.0:beta5:*:*:*:go:*:*

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